`x xx 6/7=5/14`

`=>x=5/14:6/7`

`=>x=5/14xx7/6`

`=>x=35/84`

`=>x=5/12`

Vậy `x=5/12`

__

`x:2/3=4/9`

`=>x=4/9xx2/3`

`=>x=8/27`

Vậy `x=8/27`

__

`x-1/4=3/2`

`=>x=3/2+1/4`

`=>x=6/4+1/4`

`=>x=7/4`

Vậy `x=7/4`

__

`x+4/5=8/9`

`=>x=8/9-4/5`

`=>x=40/45-36/45`

`=>x=4/45`

Vậy `x=4/45`

\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)

\(x\)         \(=\dfrac{5}{14}:\dfrac{6}{7}\)

\(x\)           \(=\dfrac{5}{12}\)

\(x:\dfrac{2}{3}=\dfrac{4}{9}\)

\(x\)        \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)

\(x\)          \(=\dfrac{8}{27}\)

\(x-\dfrac{1}{4}=\dfrac{3}{2}\)

\(x\)          \(=\dfrac{3}{2}+\dfrac{1}{4}\)

\(x\)            \(=\dfrac{7}{4}\)

\(x+\dfrac{4}{5}=\dfrac{8}{9}\)

\(x\)          \(=\dfrac{8}{9}-\dfrac{4}{5}\)

\(x\)            \(=\dfrac{4}{45}\)

bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\) 

     \(x\times\dfrac{11}{16}=2\) 

     \(x=2:\dfrac{11}{16}\) 

    \(x=\dfrac{32}{11}\)

Bài 1 : 

 \(\dfrac{x}{16}\times\left(2017-1\right)=2\)

          \(\dfrac{x}{16}\times2016=2\)

                      \(\dfrac{x}{16}=\dfrac{2}{2016}\)

                         \(x=\dfrac{2}{2016}\times16\)

                         \(x=\dfrac{1}{63}\)

1- (5\(\dfrac{4}{9}\) +x+7\(\dfrac{7}{18}\)) : 15\(\dfrac{3}{4}\) = 0 

1- (\(\dfrac{49}{9}+x+\dfrac{133}{18}\)) : \(\dfrac{63}{4}=0\) 

 (\(\dfrac{49}{9}+\dfrac{133}{18}\)+\(x\) ) : \(\dfrac{63}{4}\) = 1 - 0 

       (\(\dfrac{77}{6}\) + \(x\) ) : \(\dfrac{63}{4}\) = 1

         \(\dfrac{77}{6}+x\)         = 1 x \(\dfrac{63}{4}\) 

          \(\dfrac{77}{6}\) + \(x\)          = \(\dfrac{63}{4}\)

                  \(x\)            = \(\dfrac{63}{4}\) - \(\dfrac{77}{6}\)

                  \(x=\) \(\dfrac{35}{12}\)

209/18

=209/18

209/18

a) Có \(\frac{x-1}{9}\)=\(\frac{8}{3}\)

=> \(\left(x-1\right)\times3=8\times9\)

=>\(\left(x-1\right)\times3=27\)

=>\(x-1=27:3\)=>x-1=9=>x=9+1=10

Vậy x=10

b) Có \(\frac{-x}{4}\)=\(\frac{9}{4}\)

Vì 2 phân số này bằng nhau mà có mẫu bằng nhau nên tử cũng phải bằng nhau hay x=-9

c) Có \(\frac{x}{4}=\frac{18}{x+1}\Rightarrow x\left(x+1\right)=18\cdot4=72\)\(\Rightarrow x\times x+x\times1=72\)\(\Rightarrow2x+x=72\Rightarrow3x=72\Rightarrow x=72:3=9\)

Vậy x=9

a) x - \(\frac{1}{9}\)= \(\frac{8}{3}\)

    x       = \(\frac{8}{3}\)+ \(\frac{1}{9}\)

    x       = \(\frac{24}{9}+\frac{1}{9}\)

    x       = \(\frac{25}{9}\)

tick cho mình nha! please!!!

x-1 phần 9 mà ko phải x trừ 1 phần 9

\(\frac{x-1}{9}=\frac{8}{3}\)

\(\Rightarrow\left(x-1\right)\cdot3=8\cdot9\)

\(\Rightarrow3x-3=72\)

\(\Rightarrow3x=75\)

\(\Rightarrow x=25\)

Tự làm đi, lười thế

a) x= 1/4

b) x= -7/144

c) x= 25/6

d) x=17/7

e) x= 80/63

f) x= -45/14